.leftColumn {
    position: fixed;
    width: 200px;
    height: calc(100vh - 60px);
    background: #fff;
    box-shadow: 2px 0 8px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    overflow-y: auto;
    z-index: 100;
}

.group_3 {
    padding: 20px 0;
    width: 100%;
}

.section_3 {
    position: relative;
    display: flex;
    align-items: center;
    padding: 12px 20px;
    margin: 8px 0;
    cursor: pointer;
    transition: all 0.3s ease;
    border-left: 4px solid transparent;
}

.section_3:hover {
    background-color: #f5f9ff;
    border-left-color: #4a90e2;
}

.section_3.active {
    background-color: #e8f0fe;
    border-left-color: #1a73e8;
}

.section_3 .image_2 {
    width: 24px;
    height: 24px;
    margin-right: 12px;
    transition: all 0.3s ease;
}

.section_3:hover .image_2 {
    transform: scale(1.1);
}

.leftOption {
    color: #333;
    font-size: 15px;
    font-weight: 500;
    transition: all 0.3s ease;
    white-space: nowrap;
    text-decoration: none;
}

.section_3:hover .leftOption {
    color: #1a73e8;
}

.section_3.active .leftOption {
    color: #1a73e8;
    font-weight: 600;
}

/* 添加动画效果 */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.section_3 {
    animation: slideIn 0.3s ease forwards;
}

.section_3:nth-child(1) { animation-delay: 0.1s; }
.section_3:nth-child(2) { animation-delay: 0.2s; }
.section_3:nth-child(3) { animation-delay: 0.3s; }
.section_3:nth-child(4) { animation-delay: 0.4s; }

/* 添加图标动画 */
@keyframes iconPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.section_3:hover .image_2 {
    animation: iconPulse 0.5s ease;
}

/* 添加选中指示器 */
.section_3::after {
    content: '';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%) scaleX(0);
    width: 4px;
    height: 70%;
    background-color: #1a73e8;
    transition: transform 0.3s ease;
    border-radius: 2px 0 0 2px;
}

.section_3:hover::after,
.section_3.active::after {
    transform: translateY(-50%) scaleX(1);
}

/* 添加导航链接样式 */
.nav-link {
    text-decoration: none;
    color: inherit;
    display: flex;
    align-items: center;
    width: 100%;
    padding: 8px 0;
}

.nav-link:focus {
    outline: none;
}

/* 添加滚动��样式 */
.leftColumn::-webkit-scrollbar {
    width: 6px;
}

.leftColumn::-webkit-scrollbar-track {
    background: #f1f1f1;
}

.leftColumn::-webkit-scrollbar-thumb {
    background: #ccc;
    border-radius: 3px;
}

.leftColumn::-webkit-scrollbar-thumb:hover {
    background: #999;
}

/* 添加响应式支持 */
@media (max-width: 768px) {
    .leftColumn {
        width: 60px;
    }
    
    .leftOption {
        display: none;
    }
    
    .section_3 {
        padding: 12px;
        justify-content: center;
    }
    
    .section_3 .image_2 {
        margin-right: 0;
    }
}

/* 登录/退出按钮样式 */
.section_3:last-child {
    margin-top: auto;  /* 将登录/退出按钮推到底部 */
    border-top: 1px solid #eee;
    margin-top: 20px;
    padding-top: 20px;
}

.section_3:last-child .image_2 {
    color: #666;
}

.section_3:last-child:hover .image_2 {
    color: #1a73e8;
}

/* 登录状态显示 */
.auth-status {
    font-size: 12px;
    color: #666;
    text-align: center;
    padding: 10px 0;
    border-top: 1px solid #eee;
}

/* 登入/退出按钮样式 */
.auth-section {
    margin-top: auto;
    border-top: 1px solid #eee;
    margin-top: 20px;
    padding-top: 20px;
}

.auth-section .leftOption {
    color: #1a73e8;  /* 使用蓝色突出显示 */
}

.auth-section:hover .leftOption {
    color: #1557b0;
}

.auth-section .image_2 {
    width: 24px;
    height: 24px;
    margin-right: 12px;
    color: #666;  /* 图标颜色 */
}

.auth-section:hover .image_2 {
    color: #1a73e8;  /* 悬停时的颜色 */
}

.auth-section.active .image_2 {
    color: #1a73e8;  /* 激活时的颜色 */
}